Etymology and distribution of 昼澤.

Hirusawa 【昼澤】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Kagawa-ken Takamatsu-shi . There was a case that Shiga-ken called Kyogoku Koji's child, a warrior of warring States era. The pronunciation in estimation is Yasuke. 京極 Kyougoku reference.